The front brake discs consist of an inner carrier, which is mounted to the wheel, and an outer rotor. Both parts must be changed together as a pair.
Remove the front wheel (sect. 7 - 1, Removal of the front wheel).
Undo the retaining screws (5) of the disc to the wheel, remove the disc (7) and, on its left side, slide out the phonic wheel (6).

Removal of the front brake system
Overhauling the front brake componentsHelmet cable
Note
Helmet cable (2, fig. 104) Can be found inside the tool
kit, see "tool kit and accessories" on page 141.
Pass the cable through the helmet and insert the end of the
cable in the pin (3, fig. 104). Leave the helmet hanging and
refit the seat to hold it in place.
Warning
Th ...
Removal of the shock absorber support
Remove the rear brake master cylinder (sect. 7 - 4, Removing of the rear
brake control).
Remove the rear shock absorber (see removal of the rear shock absorber of this
section).
Loosen the screws (2) and (7) and their nuts (35).
Remove the side stand (sect. 7 - 16, Removing of the ...
Refitting the seat
Note
Apply recommended grease to the hole (a) of latch (6).
Fit the seat (1) as follows: insert the tabs (b) (on the front side) under
the rubber pads (c) of the gloves compartment;
then push the seat rear side until hearing the lock latch click.
...